Saturday, October 12, 2019

Ethernet / Internet and Networking

Ethernet :-
                To start us out,  I first want to point out that network architectures is something g that came about one day when someone sat down and said,  "We are going to design a network architectures; let's us3 CAT 3 cabling,  a star topology,  and CSMA/CD as an access method. Oh,  and let's call this architectures 10BaseT! "
          In this example,  10BaseT was the name assigned to the architecture becaus4 10 Mbps is the transfer rate of the network,  Baseband communication is the technique used to transmit the signal,  and the T means our cable type - in this case twisted - pair.  Now,  we have discussed different types of twisted - pair cabling,  but CAT 3 is the one that runs at 10 Mbps,  so it is the the cable used in 10BaseT.
       The first types of network architectures to look at the different Ethernet architectures.  When designing networks,  one of the fullest decisions we usually make is "Do we want to use Ethernet or the competing network architecture called Token Ring?  Oh,  we want to use Ethernet.  What flavor of Ethernet? " This section will help you understand what the different flavors of Ethernet are.
10base2:-
               The 10Base2 Ethernet architectures is a network that runs at 10 Mbps and uses Baseband transmissions.  10Base2 typically is implemented as a bus topology,  but it could be a mix of a bus and a star topology.  The cable type that we use is determined by the th3 character at the end of the name of the architecture - in this case a 2.  Th3 2 implies 200 meters.  Now,  what type of cable is limited to approximately 200 m?  You got it;  thinnet is limited to approxately 200 m (185 m,  be exact).  The  only characteristic we have not mentioned is the access methods that is used.  All Ethernet
The following list summarizes features of 10Base2:

  • Baseband communication 
  • 10 Mbps transfer rate 
  • Maximum distance of 185 meters per network segment 
  • 30 hosts per segment
  • 0.5 meters minimum distance between hosts


10base5:-
The 10Base5 Ethernet architectures runs at 10 Mbps and uses Baseband transmission as well.  It was also implemented as a bus topology . The cable it uses is limited to approximately 500 meters,  which is Thicknet,  and it uses CSMA/CD as the access method.  The thicker copper core in the wire allows the signal to travel farther than is possible with thinnet.

The following list summarizes features of 10Base5 :

  • Baseband communication 
  • 10 Mbps transfer rate 
  • Maximum distance of 500 meters per network segment 
  • 100 hosts per segment 
  • 2.5 meter minimum distance between hosts
10baseT:-
The 10BaseT Ethernet architecture runs at 10 Mbps and uses Baseband transmissions.  It uses a star topology with a hub or switch at the center,  allowing all systems to connect to one another.  The cable it uses is CAT 3 UTP,  which is the UTP cable type that runs at 10 Mbps.  Keep in mind that most cable types are backward compatible,  so you could have CAT 5 UTP cabling In a 10BaseT environment. 
But because the network cards and hubs are running at 10 Mbps,  that is the maximum transfer speed you will get, even through the cable supports more.  Like all Ethernet environments,  10BaseT uses CSMA/CD as the access method .
10BaseFT :-
The 10BaseFT Ethernet architecture allows for a 10 Mbps Ethernet environment that runs on fiber optic cabling.  The purpose of the fiber -optic cabling is to use it as a backbone to allow the network to reach greater distances.

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